linux-kernel - [ 17/18] ARM: 7765/1: perf: Record the user-mode PC in the call chain.

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Message-Id: <20130719021050.137138539@linuxfoundation.org>
Date:	Thu, 18 Jul 2013 19:23:32 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Jed Davis <jld@...illa.com>,
	Will Deacon <will.deacon@....com>,
	Russell King <rmk+kernel@....linux.org.uk>
Subject: [ 17/18] ARM: 7765/1: perf: Record the user-mode PC in the call chain.

3.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jed Davis <jld@...illa.com>

commit c5f927a6f62196226915f12194c9d0df4e2210d7 upstream.

With this change, we no longer lose the innermost entry in the user-mode
part of the call chain.  See also the x86 port, which includes the ip.

It's possible to partially work around this problem by post-processing
the data to use the PERF_SAMPLE_IP value, but this works only if the CPU
wasn't in the kernel when the sample was taken.

Signed-off-by: Jed Davis <jld@...illa.com>
Signed-off-by: Will Deacon <will.deacon@....com>
Signed-off-by: Russell King <rmk+kernel@....linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/arm/kernel/perf_event.c |    1 +
 1 file changed, 1 insertion(+)

--- a/arch/arm/kernel/perf_event.c
+++ b/arch/arm/kernel/perf_event.c
@@ -741,6 +741,7 @@ perf_callchain_user(struct perf_callchai
 	struct frame_tail __user *tail;
 
 
+	perf_callchain_store(entry, regs->ARM_pc);
 	tail = (struct frame_tail __user *)regs->ARM_fp - 1;
 
 	while ((entry->nr < PERF_MAX_STACK_DEPTH) &&


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